Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac400590d5b513b…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 14:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cb8824edd49013e864ea183380fa00a SHA-1: c167c689f3f3e0400d7f09d255c66bb54a39569f SHA-256: 6ac400590d5b513bae1d8d357662146b84f9160d1e66b1849384c4e5f047831f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external URIs indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=where+to+shave+balls
    • http://allasclub.com/campannas/file/12759838473.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fabup.pdf
    • http://afgventuregroup.com/cfiles/file/2941088684.pdf
    • http://simpli.ie/survey/userfiles/files/lowumud.pdf
    • https://bitree.ru/ckfinder/userfiles/files/xezikufefokaxoxupenaj.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073697f00a28---92927247437.pdf
    • http://krukaiart.com/userfiles/files/52112445840.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1905fcc97629d6a1baf9390b7f43735f/vatuzefetubo.pdf
    • https://estoniapools.com/contents//files/41163325462.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f2e4eddfe---babokijaxebenibajeda.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d0d548ebf---sulaliz.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3b6a8b245ca1b035a612ffa97f91ff45/80171357206.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607606604cd70---bufuzarejibuzij.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6fe8704e4---mabetuwitovinededigo.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1de05ee26---fadip.pdf
    • http://albino-pitti.com/pub_img/file/62963519282.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3cf61127---verubegidejijoba.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607763bc7daa9---83921975557.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc81f3c62f---dadanuxuwolalefu.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5ab381e33---79406021265.pdf
    • http://erex.hu/upload/file/fopetevenavotame.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ca96d3302404b1662f93a41ef384e157/gibozofaxaxuteke.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf233ab0258---29161364801.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed06.bin
380f28b1927d1bd062d4f25be4d23f17da11ca108c78a51d62dd484cc5d31559
pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 10208 bytes
font_01_sfnt_off00010426.bin
7397df9cc7ba2fd296fc131fae947e30a3a447a511e103e0ed2326d81b3b86de
pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16572 bytes
font_02_sfnt_off00012ef4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes